THE METHODS TO AVOID THE FORMATION OF METALLIC SILICIDE AT THE INTERFACE OF METAL/SILICON NITRIDE, AND THEIR APPLICATION FOR JOININGS

避免金属/氮化硅界面形成金属硅化物的方法及其在连接中的应用

• 批准号: 03650562
• 负责人: ATARASHIYA Koji
• 金额: $ 1.34万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650562/
• 关键词: JOINING OF METAL TO CERAMIC; SILICON NITRIDE; IRON; COBALT; NICKEL; SOLID SOLUTION OF IRON AND SILICON; METALLIC SILICIDE; MECHANICAL AND THERMAL PROPERTIES; 機械的熱的物性

THE KINETICS AND MECHANISM OF HIGH TEMPERATURE REACTIONS OF METALS WITH SILICON NITRIDE WERE INVESTIGATED. IT WAS THE PURPOSE OF THE PRESENT INVESTIGATION TO DESCRIBE THE CONDITIONS TO FORM NO BRITTLE PRODUCTS AT THE INTERFACE OF METAL/SILICON NITRIDE. THE PAUCITY OF REPORTS ON MECHANICAL PROPERTIES OF SOME METAL SILICIDES AND THE SOLID SOLUTIONS OF METAL AND SILICON SYSTEMS PROMPTED US TO INVESTIGATE THEM. MECHANICAL STRENGTH, YOUNG'S MODULUS AND LINEAR THERMAL EXPANSION COEFFICIENTS OF THE SILICIDES AND SOLID SOLUTIONS WERE MEASURED. BECAUSE THE SOLID SOLUTIONS WERE DUCTILE THEY APPEARED TO BE SUITABLE FOR JOINING. USING PLATE LIKE SAMPLES OF METALS AND SILICON NITRIDE, THE REACTION LAYERS WERE OBSERVED. IN THE CASE OF NICKEL, ONLY A SOLID SOLUTION LAYER WAS FORMED WITHOUT ANY SILICIDES AT 1273 K AND 1373 K. METALS SILICIDE LAYERS WERE FORMED IN THE CASES OF IRON AND COBALT EVEN AT 1173 K. THE SILICON CONTENT OF NICKEL SOLID SOLUTION WERE VERY LOW AND ITS DISTRIBUTION WAS UNIFORM. AND THE REACTION KINETICS OBEYED THE LINEAR RATE LAW. THUS, THE RATE DETERMINING STEP WAS THE DECOMPOSITION REACTION OF SILICON NITRIDE. THE REACTION RATE CONSTANT CAN BE EXPRESSED AS FOLLOWS: k(ms^<-1>) = 2.0 x 10^<-4> exp(-165kJmol^<-1>/RT). USING POWDERED METAL-SILICON NITRIDE MIXTURES, THE REACTION BEHAVIORS WERE OBSERVED BY MEANS OF MEASUREMENTS OF THE LIBERATED NITROGEN DURING THE REACTIONS. THE RESULTS OF THE EXPERIMENTS AGREED APPROXIMATELY WITH THOSE OF BLOCK SAMPLES. FURTHERMORE, THE ALLOYING ELEMENTS SUCH AS ALUMINUM, TITANIUN AND CHROMIUM IN NICKEL ALLOY PROMOTED THE DECOMPOSITION OF SILICON NITRIDE. BUT, THE LARGE AMOUNTS OF THEM HAD A BAD EFFECT ON THE SOLID-SOLUTION FORMATIONS TO FORM NITRIDE AND SILICIDE OF THE ALLOYING ELEMENTS.

阐述了金属与氮化硅高温反应的动力学和机理。本研究的目的是描述在金属/氮化硅界面处不形成脆性产物的条件。金属硅化物的力学性能以及金属和硅体系的固溶体的报道很少，促使我们对它们进行研究。测定了硅化物和固溶体的机械强度、杨氏模量和线膨胀系数。因为固溶体是延展性的，所以它们看起来适合于连接。使用金属和氮化硅的板状样品，观察反应层。在1273 K和1373 K下，镍只形成固溶体层，没有硅化物。铁和钴在1173 K时也形成了金属硅化物层。镍固溶体中硅含量很低，分布均匀。反应动力学符合线性速率定律。因此，速率减慢步骤是氮化硅的分解反应。反应速率常数可表示为：k（ms^<-1>）= 2.0 × 10^<-4>exp（-165kJ mol ^<-1>/RT）。采用粉末状金属-氮化硅混合物，通过测量反应过程中的释放氮来观察反应行为。实验结果与块体样品的实验结果基本一致。此外，镍合金中的铝、钛、铬等合金元素促进了氮化硅的分解。但是，它们的大量存在对合金元素形成氮化物和硅化物的固溶体形成有不良影响。